Improved retries

We tweaked how Fantasy decides when to retry a failed request.

Fantasy was already checking by:

• 408: Request Timeout
• 409: Conflict
• 429: Too Many Requests

We're now also:

• Using X-Should-Retry header if available.
• Retrying on any status code >= 500.

Changelog

Fixed

• d9de5db: fix(errors): improve check for when to retry requests (#164) (@andreynering)

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